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Ceratodus runcinatus, Plieninger. 



3844. Ceratodus runcinatus, T. Plieninger, in Meyer & Plieninger's 



Pal. Wiirttembergs, p. 80, pi. xi. fig. 8. 

 1850. Ceratodus serratus, E. Beyrick, Zeitschr. deutsch. geol. Ges. 



vol. ii. p. 163, pi. vi. figs. 3, 4. 

 18-52. Ceratodus runcinatus, F. A. Quenstedt, Handb. Petrefakt. p. 187. 

 1871. Ceratodus runcinatus, A. Giinther, Phil. Trans, pi. xxxi. fig. 10, 



pi. xxxiii. figs. 4-6. 

 1890. Hemictenodus intermedius, 0. Jaekel, Sitzungsb. Ges. naturf. 



Freunde, pp. 4, 6, woodcut. [Dental plate • Berlin Museum.] 



Type. Lower dental plate ; Stuttgart Museum. 



Dental plates thick and robust, attaining a maximum length of 

 about 0*065, triangular in shape ; angulation of inner margin acute, 

 placed close to the posterior extremity. Denticles five in the man- 

 dibular dental plates, five and a small or rudimentary sixth in the 

 palatine, very prominent and acute, much laterally compressed, 

 separated by deep notches at the outer margin, and continuous with 

 ridges extending almost or quite to the inner angulation. 



Form. Sf Log. Lettenkohle : Wiirtemberg. 



All the following specimens were obtained from Hoheneck, near 

 Ludwigsburg : — 



(i.) Upper dental plates. 



2845?). Specimen wanting first denticle. Purchased, 1853. 



38661. Two dental plates attached to bone, and six isolated ex- 

 amples. Purchased, 1864. 



40321. Broken specimen in matrix. Purchased, 1867. 



P. 765. Fine dental plate in matrix. Egerton Coll. 



(ii.) Lower dental plates. 



21228 e. Fine specimen figured by Giinther, loc. cit. pi. xxxi. fig. 10. 



Purchased, 1847. 



21228 d. Dental plate of which microscopical sections are figured 

 by Giinther, loc. cit. pi. xxxii. figs. 4-6. Purchased, 1847. 



21228 c. Four specimens. Purchased, 1847. 



28450 a. Abraded specimen. Purchased, 1853. 



38661 a. Small abraded specimen, and a large dental plate less 

 abraded. Purchased, 1864. 



42846. Broken specimen in matrix. Van Breda Coll. 



